Basically, to get those running with the new forge structure, you need to copy the content from “[your Minecraft folder]/libraries/net/minecraftforge/forge/[you forge version]/unix_args.txt” AS IS, i.e. including the line breaks and all, no additional quotes etc, into the “Additional Java Options” field under “Configuration > Java and Memory”, preferrably behind any other options you set there, especially behind the aikar flags if you use them.
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